/*
* Copyright (c) 2002-2007 JGoodies Karsten Lentzsch. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* o Neither the name of JGoodies Karsten Lentzsch nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jgoodies.forms.layout;
import java.awt.Component;
import java.awt.Insets;
import java.awt.Rectangle;
import java.io.Serializable;
import java.util.Locale;
import java.util.StringTokenizer;
/**
* Defines constraints for components that are layed out with the FormLayout.
* Defines the components display area: grid x, grid y,
* grid width (column span), grid height (row span), horizontal alignment
* and vertical alignment.<p>
*
* Most methods return <em>this</em> object to enable method chaining.<p>
*
* You can set optional insets in a constructor. This is useful if you
* need to use a pixel-size insets to align perceived component bounds
* with pixel data, for example an icon. Anyway, this is rarely used.
* The insets don't affect the size computation for columns and rows.
* I consider renaming the insets to offsets to better indicate the
* motivation for this option.<p>
*
* <strong>Examples</strong>:<br>
* The following cell constraints locate a component in the third
* column of the fifth row; column and row span are 1; the component
* will be aligned with the column's right-hand side and the row's
* bottom.
* <pre>
* CellConstraints cc = new CellConstraints();
* cc.xy (3, 5);
* cc.xy (3, 5, CellConstraints.RIGHT, CellConstraints.BOTTOM);
* cc.xy (3, 5, "right, bottom");
*
* cc.xyw (3, 5, 1);
* cc.xyw (3, 5, 1, CellConstraints.RIGHT, CellConstraints.BOTTOM);
* cc.xyw (3, 5, 1, "right, bottom");
*
* cc.xywh(3, 5, 1, 1);
* cc.xywh(3, 5, 1, 1, CellConstraints.RIGHT, CellConstraints.BOTTOM);
* cc.xywh(3, 5, 1, 1, "right, bottom");
* </pre>
* See also the examples in the {@link FormLayout} class comment.<p>
*
* TODO: Explain in the JavaDocs that the insets are actually offsets.
* And describe that these offsets are not taken into account when
* FormLayout computes the column and row sizes.<p>
*
* TODO: Rename the inset to offsets.<p>
*
* TODO: In the Forms 1.0.x invisible components are not taken into account
* when the FormLayout lays out the container. Add an optional setting for
* this on both the container-level and component-level. So one can specify
* that invisible components shall be taken into account, but may exclude
* individual components. Or the other way round, exclude invisible components,
* and include individual components. The API of both the FormLayout and
* CellConstraints classes shall be extended to support this option.
* This feature is planned for the Forms version 1.1 and is described in
* <a href="https://forms.dev.java.net/issues/show_bug.cgi?id=28">issue #28</a>
* of the Forms' issue tracker where you can track the progress.
*
* @author Karsten Lentzsch
* @version $Revision$
*/
public final class CellConstraints implements Cloneable, Serializable {
// Alignment Constants *************************************************
/*
* Implementation Note: Do not change the order of the following constants.
* The serialization of class Alignment is ordinal-based and relies on it.
*/
/**
* Use the column's or row's default alignment.
*/
public static final Alignment DEFAULT = new Alignment("default",
Alignment.BOTH);
/**
* Fill the cell either horizontally or vertically.
*/
public static final Alignment FILL = new Alignment("fill", Alignment.BOTH);
/**
* Put the component in the left.
*/
public static final Alignment LEFT = new Alignment("left",
Alignment.HORIZONTAL);
/**
* Put the component in the right.
*/
public static final Alignment RIGHT = new Alignment("right",
Alignment.HORIZONTAL);
/**
* Put the component in the center.
*/
public static final Alignment CENTER = new Alignment("center",
Alignment.BOTH);
/**
* Put the component in the top.
*/
public static final Alignment TOP = new Alignment("top", Alignment.VERTICAL);
/**
* Put the component in the bottom.
*/
public static final Alignment BOTTOM = new Alignment("bottom",
Alignment.VERTICAL);
/**
* An array of all enumeration values used to canonicalize
* deserialized alignments.
*/
private static final Alignment[] VALUES = { DEFAULT, FILL, LEFT, RIGHT,
CENTER, TOP, BOTTOM };
/**
* A reusable <code>Insets</code> object to reduce object instantiation.
*/
private static final Insets EMPTY_INSETS = new Insets(0, 0, 0, 0);
// Fields ***************************************************************
/**
* Describes the component's horizontal grid origin (starts at 1).
*/
public int gridX;
/**
* Describes the component's vertical grid origin (starts at 1).
*/
public int gridY;
/**
* Describes the component's horizontal grid extend (number of cells).
*/
public int gridWidth;
/**
* Describes the component's vertical grid extent (number of cells).
*/
public int gridHeight;
/**
* Describes the component's horizontal alignment.
*/
public Alignment hAlign;
/**
* Describes the component's vertical alignment.
*/
public Alignment vAlign;
/**
* Describes the component's <code>Insets</code> in it's display area.
*/
public Insets insets;
// Instance Creation ****************************************************
/**
* Constructs a default instance of <code>CellConstraints</code>.
*/
public CellConstraints() {
this(1, 1);
}
/**
* Constructs an instance of <code>CellConstraints</code> for the given
* cell position.<p>
*
* <strong>Examples:</strong><pre>
* new CellConstraints(1, 3);
* new CellConstraints(1, 3);
* </pre>
*
* @param gridX the component's horizontal grid origin
* @param gridY the component's vertical grid origin
*/
public CellConstraints(int gridX, int gridY) {
this(gridX, gridY, 1, 1);
}
/**
* Constructs an instance of <code>CellConstraints</code> for the given
* cell position, anchor, and fill.<p>
*
* <strong>Examples:</strong><pre>
* new CellConstraints(1, 3, CellConstraints.LEFT, CellConstraints.BOTTOM);
* new CellConstraints(1, 3, CellConstraints.CENTER, CellConstraints.FILL);
* </pre>
*
* @param gridX the component's horizontal grid origin
* @param gridY the component's vertical grid origin
* @param hAlign the component's horizontal alignment
* @param vAlign the component's vertical alignment
*/
public CellConstraints(int gridX, int gridY, Alignment hAlign,
Alignment vAlign) {
this(gridX, gridY, 1, 1, hAlign, vAlign, EMPTY_INSETS);
}
/**
* Constructs an instance of <code>CellConstraints</code> for the given
* cell position and size.<p>
*
* <strong>Examples:</strong><pre>
* new CellConstraints(1, 3, 2, 1);
* new CellConstraints(1, 3, 7, 3);
* </pre>
*
* @param gridX the component's horizontal grid origin
* @param gridY the component's vertical grid origin
* @param gridWidth the component's horizontal extent
* @param gridHeight the component's vertical extent
*/
public CellConstraints(int gridX, int gridY, int gridWidth, int gridHeight) {
this(gridX, gridY, gridWidth, gridHeight, DEFAULT, DEFAULT);
}
/**
* Constructs an instance of <code>CellConstraints</code> for the given
* cell position and size, anchor, and fill.<p>
*
* <strong>Examples:</strong><pre>
* new CellConstraints(1, 3, 2, 1, CellConstraints.LEFT, CellConstraints.BOTTOM);
* new CellConstraints(1, 3, 7, 3, CellConstraints.CENTER, CellConstraints.FILL);
* </pre>
*
* @param gridX the component's horizontal grid origin
* @param gridY the component's vertical grid origin
* @param gridWidth the component's horizontal extent
* @param gridHeight the component's vertical extent
* @param hAlign the component's horizontal alignment
* @param vAlign the component's vertical alignment
*/
public CellConstraints(int gridX, int gridY, int gridWidth, int gridHeight,
Alignment hAlign, Alignment vAlign) {
this(gridX, gridY, gridWidth, gridHeight, hAlign, vAlign, EMPTY_INSETS);
}
/**
* Constructs an instance of <code>CellConstraints</code> for
* the complete set of available properties.<p>
*
* <strong>Examples:</strong><pre>
* new CellConstraints(1, 3, 2, 1, CellConstraints.LEFT, CellConstraints.BOTTOM, new Insets(0, 1, 0, 3));
* new CellConstraints(1, 3, 7, 3, CellConstraints.CENTER, CellConstraints.FILL, new Insets(0, 1, 0, 0));
* </pre>
*
* @param gridX the component's horizontal grid origin
* @param gridY the component's vertical grid origin
* @param gridWidth the component's horizontal extent
* @param gridHeight the component's vertical extent
* @param hAlign the component's horizontal alignment
* @param vAlign the component's vertical alignment
* @param insets the component's display area <code>Insets</code>
* @exception IndexOutOfBoundsException if the grid origin or extent is negative
* @exception NullPointerException if the horizontal or vertical alignment is null
* @exception IllegalArgumentException if an alignment orientation is invalid
*/
public CellConstraints(int gridX, int gridY, int gridWidth, int gridHeight,
Alignment hAlign, Alignment vAlign, Insets insets) {
this.gridX = gridX;
this.gridY = gridY;
this.gridWidth = gridWidth;
this.gridHeight = gridHeight;
this.hAlign = hAlign;
this.vAlign = vAlign;
this.insets = insets;
if (gridX <= 0) {
throw new IndexOutOfBoundsException(
"The grid x must be a positive number.");
}
if (gridY <= 0) {
throw new IndexOutOfBoundsException(
"The grid y must be a positive number.");
}
if (gridWidth <= 0) {
throw new IndexOutOfBoundsException(
"The grid width must be a positive number.");
}
if (gridHeight <= 0) {
throw new IndexOutOfBoundsException(
"The grid height must be a positive number.");
}
if (hAlign == null) {
throw new NullPointerException(
"The horizontal alignment must not be null.");
}
if (vAlign == null) {
throw new NullPointerException(
"The vertical alignment must not be null.");
}
ensureValidOrientations(hAlign, vAlign);
}
/**
* Constructs an instance of <code>CellConstraints</code> from
* the given encoded string properties.<p>
*
* <strong>Examples:</strong><pre>
* new CellConstraints("1, 3");
* new CellConstraints("1, 3, left, bottom");
* new CellConstraints("1, 3, 2, 1, left, bottom");
* new CellConstraints("1, 3, 2, 1, l, b");
* </pre>
*
* @param encodedConstraints the constraints encoded as string
*/
public CellConstraints(String encodedConstraints) {
this();
initFromConstraints(encodedConstraints);
}
// Setters **************************************************************
/**
* Sets row and column origins; sets width and height to 1;
* uses the default alignments.<p>
*
* <strong>Examples:</strong><pre>
* cc.xy(1, 1);
* cc.xy(1, 3);
* </pre>
*
* @param col the new column index
* @param row the new row index
* @return this
*/
public CellConstraints xy(int col, int row) {
return xywh(col, row, 1, 1);
}
/**
* Sets row and column origins; sets width and height to 1;
* decodes horizontal and vertical alignments from the given string.<p>
*
* <strong>Examples:</strong><pre>
* cc.xy(1, 3, "left, bottom");
* cc.xy(1, 3, "l, b");
* cc.xy(1, 3, "center, fill");
* cc.xy(1, 3, "c, f");
* </pre>
*
* @param col the new column index
* @param row the new row index
* @param encodedAlignments describes the horizontal and vertical alignments
* @return this
* @exception IllegalArgumentException if an alignment orientation is invalid
*/
public CellConstraints xy(int col, int row, String encodedAlignments) {
return xywh(col, row, 1, 1, encodedAlignments);
}
/**
* Sets the row and column origins; sets width and height to 1;
* set horizontal and vertical alignment using the specified objects.<p>
*
* <strong>Examples:</strong><pre>
* cc.xy(1, 3, CellConstraints.LEFT, CellConstraints.BOTTOM);
* cc.xy(1, 3, CellConstraints.CENTER, CellConstraints.FILL);
* </pre>
*
* @param col the new column index
* @param row the new row index
* @param colAlign horizontal component alignment
* @param rowAlign vertical component alignment
* @return this
*/
public CellConstraints xy(int col, int row, Alignment colAlign,
Alignment rowAlign) {
return xywh(col, row, 1, 1, colAlign, rowAlign);
}
/**
* Sets the row, column, width, and height; uses a height (row span) of 1
* and the horizontal and vertical default alignments.<p>
*
* <strong>Examples:</strong><pre>
* cc.xyw(1, 3, 7);
* cc.xyw(1, 3, 2);
* </pre>
*
* @param col the new column index
* @param row the new row index
* @param colSpan the column span or grid width
* @return this
*/
public CellConstraints xyw(int col, int row, int colSpan) {
return xywh(col, row, colSpan, 1, DEFAULT, DEFAULT);
}
/**
* Sets the row, column, width, and height;
* decodes the horizontal and vertical alignments from the given string.
* The row span (height) is set to 1.<p>
*
* <strong>Examples:</strong><pre>
* cc.xyw(1, 3, 7, "left, bottom");
* cc.xyw(1, 3, 7, "l, b");
* cc.xyw(1, 3, 2, "center, fill");
* cc.xyw(1, 3, 2, "c, f");
* </pre>
*
* @param col the new column index
* @param row the new row index
* @param colSpan the column span or grid width
* @param encodedAlignments describes the horizontal and vertical alignments
* @return this
* @exception IllegalArgumentException if an alignment orientation is invalid
*/
public CellConstraints xyw(int col, int row, int colSpan,
String encodedAlignments) {
return xywh(col, row, colSpan, 1, encodedAlignments);
}
/**
* Sets the row, column, width, and height; sets the horizontal
* and vertical aligment using the specified alignment objects.
* The row span (height) is set to 1.<p>
*
* <strong>Examples:</strong><pre>
* cc.xyw(1, 3, 2, CellConstraints.LEFT, CellConstraints.BOTTOM);
* cc.xyw(1, 3, 7, CellConstraints.CENTER, CellConstraints.FILL);
* </pre>
*
* @param col the new column index
* @param row the new row index
* @param colSpan the column span or grid width
* @param colAlign horizontal component alignment
* @param rowAlign vertical component alignment
* @return this
* @exception IllegalArgumentException if an alignment orientation is invalid
*/
public CellConstraints xyw(int col, int row, int colSpan,
Alignment colAlign, Alignment rowAlign) {
return xywh(col, row, colSpan, 1, colAlign, rowAlign);
}
/**
* Sets the row, column, width, and height; uses default alignments.<p>
*
* <strong>Examples:</strong><pre>
* cc.xywh(1, 3, 2, 1);
* cc.xywh(1, 3, 7, 3);
* </pre>
*
* @param col the new column index
* @param row the new row index
* @param colSpan the column span or grid width
* @param rowSpan the row span or grid height
* @return this
*/
public CellConstraints xywh(int col, int row, int colSpan, int rowSpan) {
return xywh(col, row, colSpan, rowSpan, DEFAULT, DEFAULT);
}
/**
* Sets the row, column, width, and height;
* decodes the horizontal and vertical alignments from the given string.<p>
*
* <strong>Examples:</strong><pre>
* cc.xywh(1, 3, 2, 1, "left, bottom");
* cc.xywh(1, 3, 2, 1, "l, b");
* cc.xywh(1, 3, 7, 3, "center, fill");
* cc.xywh(1, 3, 7, 3, "c, f");
* </pre>
*
* @param col the new column index
* @param row the new row index
* @param colSpan the column span or grid width
* @param rowSpan the row span or grid height
* @param encodedAlignments describes the horizontal and vertical alignments
* @return this
* @exception IllegalArgumentException if an alignment orientation is invalid
*/
public CellConstraints xywh(int col, int row, int colSpan, int rowSpan,
String encodedAlignments) {
CellConstraints result = xywh(col, row, colSpan, rowSpan);
result.setAlignments(encodedAlignments);
return result;
}
/**
* Sets the row, column, width, and height; sets the horizontal
* and vertical aligment using the specified alignment objects.<p>
*
* <strong>Examples:</strong><pre>
* cc.xywh(1, 3, 2, 1, CellConstraints.LEFT, CellConstraints.BOTTOM);
* cc.xywh(1, 3, 7, 3, CellConstraints.CENTER, CellConstraints.FILL);
* </pre>
*
* @param col the new column index
* @param row the new row index
* @param colSpan the column span or grid width
* @param rowSpan the row span or grid height
* @param colAlign horizontal component alignment
* @param rowAlign vertical component alignment
* @return this
* @exception IllegalArgumentException if an alignment orientation is invalid
*/
public CellConstraints xywh(int col, int row, int colSpan, int rowSpan,
Alignment colAlign, Alignment rowAlign) {
this.gridX = col;
this.gridY = row;
this.gridWidth = colSpan;
this.gridHeight = rowSpan;
this.hAlign = colAlign;
this.vAlign = rowAlign;
ensureValidOrientations(hAlign, vAlign);
return this;
}
// Parsing and Decoding String Descriptions *****************************
/**
* Decodes and returns the grid bounds and alignments for this
* constraints as an array of six integers. The string representation
* is a comma separated sequence, one of
* <pre>
* "x, y"
* "x, y, w, h"
* "x, y, hAlign, vAlign"
* "x, y, w, h, hAlign, vAlign"
* </pre>
*
* @param encodedConstraints represents horizontal and vertical alignment
* @exception IllegalArgumentException if the encoded constraints do not
* follow the constraint syntax
*/
private void initFromConstraints(String encodedConstraints) {
StringTokenizer tokenizer = new StringTokenizer(encodedConstraints,
" ,");
int argCount = tokenizer.countTokens();
if (!(argCount == 2 || argCount == 4 || argCount == 6)) {
throw new IllegalArgumentException(
"You must provide 2, 4 or 6 arguments.");
}
Integer nextInt = decodeInt(tokenizer.nextToken());
if (nextInt == null) {
throw new IllegalArgumentException(
"First cell constraint element must be a number.");
}
gridX = nextInt.intValue();
if (gridX <= 0) {
throw new IndexOutOfBoundsException(
"The grid x must be a positive number.");
}
nextInt = decodeInt(tokenizer.nextToken());
if (nextInt == null) {
throw new IllegalArgumentException(
"Second cell constraint element must be a number.");
}
gridY = nextInt.intValue();
if (gridY <= 0) {
throw new IndexOutOfBoundsException(
"The grid y must be a positive number.");
}
if (!tokenizer.hasMoreTokens()) {
return;
}
String token = tokenizer.nextToken();
nextInt = decodeInt(token);
if (nextInt != null) {
// Case: "x, y, w, h" or
// "x, y, w, h, hAlign, vAlign"
gridWidth = nextInt.intValue();
if (gridWidth <= 0) {
throw new IndexOutOfBoundsException(
"The grid width must be a positive number.");
}
nextInt = decodeInt(tokenizer.nextToken());
if (nextInt == null) {
throw new IllegalArgumentException(
"Fourth cell constraint element must be like third.");
}
gridHeight = nextInt.intValue();
if (gridHeight <= 0) {
throw new IndexOutOfBoundsException(
"The grid height must be a positive number.");
}
if (!tokenizer.hasMoreTokens()) {
return;
}
token = tokenizer.nextToken();
}
hAlign = decodeAlignment(token);
vAlign = decodeAlignment(tokenizer.nextToken());
ensureValidOrientations(hAlign, vAlign);
}
/**
* Decodes a string description for the horizontal and vertical alignment
* and sets this CellConstraints' alignment values.<p>
*
* Valid horizontal aligmnents are: left, middle, right, default, and fill.
* Valid vertical alignments are: top, center, bottom, default, and fill.
* The anchor's string representation abbreviates the alignment:
* l, m, r, d, f, t, c, and b.<p>
*
* Anchor examples:
* "m, c" is centered, "l, t" is northwest, "m, t" is north, "r, c" east.
* "m, d" is horizontally centered and uses the row's default alignment.
* "d, t" is on top of the cell and uses the column's default alignment.<p>
*
* @param encodedAlignments represents horizontal and vertical alignment
* @exception IllegalArgumentException if an alignment orientation is invalid
*/
private void setAlignments(String encodedAlignments) {
StringTokenizer tokenizer = new StringTokenizer(encodedAlignments, " ,");
hAlign = decodeAlignment(tokenizer.nextToken());
vAlign = decodeAlignment(tokenizer.nextToken());
ensureValidOrientations(hAlign, vAlign);
}
/**
* Decodes an integer string representation and returns the
* associated Integer or null in case of an invalid number format.
*
* @param token the encoded integer
* @return the decoded Integer or null
*/
private Integer decodeInt(String token) {
try {
return Integer.decode(token);
} catch (NumberFormatException e) {
return null;
}
}
/**
* Parses an alignment string description and
* returns the corresponding alignment value.
*
* @param encodedAlignment the encoded alignment
* @return the associated <code>Alignment</code> instance
*/
private Alignment decodeAlignment(String encodedAlignment) {
return Alignment.valueOf(encodedAlignment);
}
/**
* Checks and verifies that this constraints object has valid grid
* index values, i. e. the display area cells are inside the form's grid.
*
* @param colCount number of columns in the grid
* @param rowCount number of rows in the grid
* @exception IndexOutOfBoundsException if the display area described
* by this constraints object is not inside the grid
*/
void ensureValidGridBounds(int colCount, int rowCount) {
if (gridX <= 0) {
throw new IndexOutOfBoundsException("The column index " + gridX
+ " must be positive.");
}
if (gridX > colCount) {
throw new IndexOutOfBoundsException("The column index " + gridX
+ " must be less than or equal to " + colCount + ".");
}
if (gridX + gridWidth - 1 > colCount) {
throw new IndexOutOfBoundsException("The grid width " + gridWidth
+ " must be less than or equal to "
+ (colCount - gridX + 1) + ".");
}
if (gridY <= 0) {
throw new IndexOutOfBoundsException("The row index " + gridY
+ " must be positive.");
}
if (gridY > rowCount) {
throw new IndexOutOfBoundsException("The row index " + gridY
+ " must be less than or equal to " + rowCount + ".");
}
if (gridY + gridHeight - 1 > rowCount) {
throw new IndexOutOfBoundsException("The grid height " + gridHeight
+ " must be less than or equal to "
+ (rowCount - gridY + 1) + ".");
}
}
/**
* Checks and verifies that the horizontal alignment is a horizontal
* and the vertical alignment is vertical.
*
* @param horizontalAlignment the horizontal alignment
* @param verticalAlignment the vertical alignment
* @exception IllegalArgumentException if an alignment is invalid
*/
private void ensureValidOrientations(Alignment horizontalAlignment,
Alignment verticalAlignment) {
if (!horizontalAlignment.isHorizontal()) {
throw new IllegalArgumentException(
"The horizontal alignment must be one of: left, center, right, fill, default.");
}
if (!verticalAlignment.isVertical()) {
throw new IllegalArgumentException(
"The vertical alignment must be one of: top, center, botto, fill, default.");
}
}
// Settings Component Bounds ********************************************
/**
* Sets the component's bounds using the given component and cell bounds.
*
* @param c the component to set bounds
* @param layout the FormLayout instance that computes the bounds
* @param cellBounds the cell's bounds
* @param minWidthMeasure measures the minimum width
* @param minHeightMeasure measures the minimum height
* @param prefWidthMeasure measures the preferred width
* @param prefHeightMeasure measures the preferred height
*/
void setBounds(Component c, FormLayout layout, Rectangle cellBounds,
FormLayout.Measure minWidthMeasure,
FormLayout.Measure minHeightMeasure,
FormLayout.Measure prefWidthMeasure,
FormLayout.Measure prefHeightMeasure) {
ColumnSpec colSpec = gridWidth == 1 ? layout.getColumnSpec(gridX)
: null;
RowSpec rowSpec = gridHeight == 1 ? layout.getRowSpec(gridY) : null;
Alignment concreteHAlign = concreteAlignment(this.hAlign, colSpec);
Alignment concreteVAlign = concreteAlignment(this.vAlign, rowSpec);
Insets concreteInsets = this.insets != null ? this.insets
: EMPTY_INSETS;
int cellX = cellBounds.x + concreteInsets.left;
int cellY = cellBounds.y + concreteInsets.top;
int cellW = cellBounds.width - concreteInsets.left
- concreteInsets.right;
int cellH = cellBounds.height - concreteInsets.top
- concreteInsets.bottom;
int compW = componentSize(c, colSpec, cellW, minWidthMeasure,
prefWidthMeasure);
int compH = componentSize(c, rowSpec, cellH, minHeightMeasure,
prefHeightMeasure);
int x = origin(concreteHAlign, cellX, cellW, compW);
int y = origin(concreteVAlign, cellY, cellH, compH);
int w = extent(concreteHAlign, cellW, compW);
int h = extent(concreteVAlign, cellH, compH);
c.setBounds(x, y, w, h);
}
/**
* Computes and returns the concrete alignment. Takes into account
* the cell alignment and <i>the</i> <code>FormSpec</code> if applicable.<p>
*
* If this constraints object doesn't belong to a single column or row,
* the <code>formSpec</code> parameter is <code>null</code>.
* In this case the cell alignment is answered, but <code>DEFAULT</code>
* is mapped to <code>FILL</code>.<p>
*
* If the cell belongs to a single column or row, we use the cell
* alignment, unless it is <code>DEFAULT</code>, where the alignment
* is inherited from the column or row resp.
*
* @param cellAlignment this cell's aligment
* @param formSpec the associated column or row specification
* @return the concrete alignment
*/
private Alignment concreteAlignment(Alignment cellAlignment,
FormSpec formSpec) {
return formSpec == null ? (cellAlignment == DEFAULT ? FILL
: cellAlignment) : usedAlignment(cellAlignment, formSpec);
}
/**
* Returns the alignment used for a given form constraints object.
* The cell alignment overrides the column or row default, unless
* it is <code>DEFAULT</code>. In the latter case, we use the
* column or row alignment.
*
* @param cellAlignment this cell constraint's alignment
* @param formSpec the associated column or row specification
* @return the alignment used
*/
private Alignment usedAlignment(Alignment cellAlignment, FormSpec formSpec) {
if (cellAlignment != CellConstraints.DEFAULT) {
// Cell alignments other than DEFAULT override col/row alignments
return cellAlignment;
}
FormSpec.DefaultAlignment defaultAlignment = formSpec
.getDefaultAlignment();
if (defaultAlignment == FormSpec.FILL_ALIGN) {
return FILL;
}
if (defaultAlignment == ColumnSpec.LEFT) {
return LEFT;
} else if (defaultAlignment == FormSpec.CENTER_ALIGN) {
return CENTER;
} else if (defaultAlignment == ColumnSpec.RIGHT) {
return RIGHT;
} else if (defaultAlignment == RowSpec.TOP) {
return TOP;
} else {
return BOTTOM;
}
}
/**
* Computes and returns the pixel size of the given component using the
* given form specification, measures, and cell size.
*
* @param component the component to measure
* @param formSpec the specification of the component's column/row
* @param minMeasure the measure for the minimum size
* @param prefMeasure the measure for the preferred size
* @param cellSize the cell size
* @return the component size as measured or a constant
*/
private int componentSize(Component component, FormSpec formSpec,
int cellSize, FormLayout.Measure minMeasure,
FormLayout.Measure prefMeasure) {
if (formSpec == null) {
return prefMeasure.sizeOf(component);
} else if (formSpec.getSize() == Sizes.MINIMUM) {
return minMeasure.sizeOf(component);
} else if (formSpec.getSize() == Sizes.PREFERRED) {
return prefMeasure.sizeOf(component);
} else { // default mode
return Math.min(cellSize, prefMeasure.sizeOf(component));
}
}
/**
* Computes and returns the component's pixel origin.
*
* @param alignment the component's alignment
* @param cellOrigin the origin of the display area
* @param cellSize the extent of the display area
* @param componentSize
* @return the component's pixel origin
*/
private int origin(Alignment alignment, int cellOrigin, int cellSize,
int componentSize) {
if (alignment == RIGHT || alignment == BOTTOM) {
return cellOrigin + cellSize - componentSize;
} else if (alignment == CENTER) {
return cellOrigin + (cellSize - componentSize) / 2;
} else { // left, top, fill
return cellOrigin;
}
}
/**
* Returns the component's pixel extent.
*
* @param alignment the component's alignment
* @param cellSize the size of the display area
* @param componentSize the component's size
* @return the component's pixel extent
*/
private int extent(Alignment alignment, int cellSize, int componentSize) {
return alignment == FILL ? cellSize : componentSize;
}
// Misc *****************************************************************
/**
* Creates a copy of this cell constraints object.
*
* @return a copy of this cell constraints object
*/
public Object clone() {
try {
CellConstraints c = (CellConstraints) super.clone();
c.insets = (Insets) insets.clone();
return c;
} catch (CloneNotSupportedException e) {
// This shouldn't happen, since we are Cloneable.
throw new InternalError();
}
}
/**
* Constructs and returns a string representation of this constraints object.
*
* @return string representation of this constraints object
*/
public String toString() {
StringBuffer buffer = new StringBuffer("CellConstraints");
buffer.append("[x=");
buffer.append(gridX);
buffer.append("; y=");
buffer.append(gridY);
buffer.append("; w=");
buffer.append(gridWidth);
buffer.append("; h=");
buffer.append(gridHeight);
buffer.append("; hAlign=");
buffer.append(hAlign);
buffer.append("; vAlign=");
buffer.append(vAlign);
if (!(EMPTY_INSETS.equals(insets))) {
buffer.append("; insets=");
buffer.append(insets);
}
buffer.append(']');
return buffer.toString();
}
/**
* Returns a short string representation of this constraints object.
*
* @return a short string representation of this constraints object
*/
public String toShortString() {
return toShortString(null);
}
/**
* Returns a short string representation of this constraints object.
* This method can use the given <code>FormLayout</code>
* to display extra information how default alignments
* are mapped to concrete alignments. Therefore it asks the
* related column and row as specified by this constraints object.
*
* @param layout the layout to be presented as a string
* @return a short string representation of this constraints object
*/
public String toShortString(FormLayout layout) {
StringBuffer buffer = new StringBuffer("(");
buffer.append(formatInt(gridX));
buffer.append(", ");
buffer.append(formatInt(gridY));
buffer.append(", ");
buffer.append(formatInt(gridWidth));
buffer.append(", ");
buffer.append(formatInt(gridHeight));
buffer.append(", \"");
buffer.append(hAlign.abbreviation());
if (hAlign == DEFAULT && layout != null) {
buffer.append('=');
ColumnSpec colSpec = gridWidth == 1 ? layout.getColumnSpec(gridX)
: null;
buffer.append(concreteAlignment(hAlign, colSpec).abbreviation());
}
buffer.append(", ");
buffer.append(vAlign.abbreviation());
if (vAlign == DEFAULT && layout != null) {
buffer.append('=');
RowSpec rowSpec = gridHeight == 1 ? layout.getRowSpec(gridY) : null;
buffer.append(concreteAlignment(vAlign, rowSpec).abbreviation());
}
buffer.append("\"");
if (!(EMPTY_INSETS.equals(insets))) {
buffer.append(", ");
buffer.append(insets);
}
buffer.append(')');
return buffer.toString();
}
// Helper Class *********************************************************
/**
* An ordinal-based serializable typesafe enumeration for component
* alignment types as used by the {@link FormLayout}.
*/
public static final class Alignment implements Serializable {
private static final int HORIZONTAL = 0;
private static final int VERTICAL = 1;
private static final int BOTH = 2;
private final transient String name;
private final transient int orientation;
private Alignment(String name, int orientation) {
this.name = name;
this.orientation = orientation;
}
static Alignment valueOf(String nameOrAbbreviation) {
String str = nameOrAbbreviation.toLowerCase(Locale.ENGLISH);
if (str.equals("d") || str.equals("default")) {
return DEFAULT;
} else if (str.equals("f") || str.equals("fill")) {
return FILL;
} else if (str.equals("c") || str.equals("center")) {
return CENTER;
} else if (str.equals("l") || str.equals("left")) {
return LEFT;
} else if (str.equals("r") || str.equals("right")) {
return RIGHT;
} else if (str.equals("t") || str.equals("top")) {
return TOP;
} else if (str.equals("b") || str.equals("bottom")) {
return BOTTOM;
} else {
throw new IllegalArgumentException(
"Invalid alignment "
+ nameOrAbbreviation
+ ". Must be one of: left, center, right, top, bottom, "
+ "fill, default, l, c, r, t, b, f, d.");
}
}
/**
* Returns this Alignment's name.
*
* @return this alignment's name.
*/
public String toString() {
return name;
}
/**
* Returns the first character of this Alignment's name.
* Used to identify it in short format strings.
*
* @return the name's first character.
*/
public char abbreviation() {
return name.charAt(0);
}
private boolean isHorizontal() {
return orientation != VERTICAL;
}
private boolean isVertical() {
return orientation != HORIZONTAL;
}
// Serialization *********************************************************
private static int nextOrdinal = 0;
private final int ordinal = nextOrdinal++;
private Object readResolve() {
return VALUES[ordinal]; // Canonicalize
}
}
/**
* Returns an integer that has a minimum of two characters.
*
* @param number the number to format
* @return a string representation for a number with a minum of two chars
*/
private String formatInt(int number) {
String str = Integer.toString(number);
return number < 10 ? " " + str : str;
}
}